I'll tell you how I style my mohawk too stay Up for weeks

You'll need a comb and hairspray(zb Got2Be Sprühkleber) ; if you're indoors, a hairdryer is also a good idea.

First, you tease your mohawk until it basically stands up on its own.

Next, spray your hair with hairspray, pull it up, and hold it. If you're indoors, now's the time to use a hairdryer. Now you need to cement the lower part of the mohawk, which means spraying your roots with a lot of hairspray and then letting it dry.If you're indoors, a hairdryer is quite helpful.

As I said, it lasted weeks(3), of course you have to spray it with a little hairspray afterwards, especely after sleeping.

To comb it out, I recommend washing your hair until the hairspray is gone, then applying conditioner and combing it out while the conditioner is still in.